1. Once a sports goods retailer organized a campaign "Run to
   remember" to spread awareness about benefits of walking. In that
   Soham and Baani participated. There was a circular path around a
   sports field. Soham took 12 minutes to drive one round of the field,
   while Baani took 18 minutes for the same. Suppose they started at
   the same point and at the same time and went in the same direction.
   After how many minutes have they met again at the starting point?
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